We have two flocks of grown chickens and are working towards combining them. We also have 16 chicks ready to go outside and four three week olds. We want to put the 16 chicks in the smaller pen. We took them on a field trip out there while the big guys were free ranging. They were terrified. They bunched up in a corner and wouldn't explore or eat or drink. We even brought in a gentle hen to show them the ropes. They seem clueless. One of the little guys tidbits every time I feed them, so I know it's instinct, but not one of them was curious about the outdoors, just scared. None of the big chickens did this. How do I get them used to and enjoying the outdoors?